题解 | #多项式输出#

#include<iostream>
using namespace std;
int main(){
 int n=0;
 cin>>n;
    int a=0;
    for(int i=n;i>=0;i--){
        cin>>a;
        if(i==0){
            if(a<0) cout<<a;
            if(a>0) cout<<"+"<<a;
        }
        else if(i==n&&i!=1){
            if(a<0&&a!=-1) cout<<a<<"x^"<<i;
            else if(a<0&&a==-1) cout<<"-x^"<<i;
            else if(a>0&&a!=1) cout<<a<<"x^"<<i;
            else if(a>0&&a==1) cout<<"x^"<<i;
        }
        else if(i==1){
            if(a<0&&a!=-1) cout<<a<<"x";
            else if(a<0&&a==-1) cout<<"-x";
            else if(a>0&&a!=1) cout<<"+"<<a<<"x";
            else if(a>0&&a==1) cout<<"+"<<"x";
        }
        else{
            if(a<0&&a!=-1) cout<<a<<"x^"<<i;
            else if(a<0&&a==-1) cout<<"-x^"<<i;
            else if(a>0&&a!=1) cout<<"+"<<a<<"x^"<<i;
            else if(a>0&&a==1) cout<<"+"<<"x^"<<i;
        }
    }


}